181 lines
4.5 KiB
C
181 lines
4.5 KiB
C
/* Software floating-point emulation.
|
|
Copyright (C) 1997,1998,1999,2000,2002,2003 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Richard Henderson (rth@cygnus.com),
|
|
Jakub Jelinek (jj@ultra.linux.cz),
|
|
David S. Miller (davem@redhat.com) and
|
|
Peter Maydell (pmaydell@chiark.greenend.org.uk).
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
#ifndef SOFT_FP_H
|
|
#define SOFT_FP_H
|
|
|
|
#include "sfp-machine.h"
|
|
|
|
/* Allow sfp-machine to have its own byte order definitions. */
|
|
#ifndef __BYTE_ORDER
|
|
#include <endian.h>
|
|
#endif
|
|
|
|
#define _FP_WORKBITS 3
|
|
#define _FP_WORK_LSB ((_FP_W_TYPE)1 << 3)
|
|
#define _FP_WORK_ROUND ((_FP_W_TYPE)1 << 2)
|
|
#define _FP_WORK_GUARD ((_FP_W_TYPE)1 << 1)
|
|
#define _FP_WORK_STICKY ((_FP_W_TYPE)1 << 0)
|
|
|
|
#ifndef FP_RND_NEAREST
|
|
# define FP_RND_NEAREST 0
|
|
# define FP_RND_ZERO 1
|
|
# define FP_RND_PINF 2
|
|
# define FP_RND_MINF 3
|
|
#endif
|
|
#ifndef FP_ROUNDMODE
|
|
# define FP_ROUNDMODE FP_RND_NEAREST
|
|
#endif
|
|
|
|
/* By default don't care about exceptions. */
|
|
#ifndef FP_EX_INVALID
|
|
#define FP_EX_INVALID 0
|
|
#endif
|
|
#ifndef FP_EX_OVERFLOW
|
|
#define FP_EX_OVERFLOW 0
|
|
#endif
|
|
#ifndef FP_EX_UNDERFLOW
|
|
#define FP_EX_UNDERFLOW 0
|
|
#endif
|
|
#ifndef FP_EX_DIVZERO
|
|
#define FP_EX_DIVZERO 0
|
|
#endif
|
|
#ifndef FP_EX_INEXACT
|
|
#define FP_EX_INEXACT 0
|
|
#endif
|
|
#ifndef FP_EX_DENORM
|
|
#define FP_EX_DENORM 0
|
|
#endif
|
|
|
|
#ifdef _FP_DECL_EX
|
|
#define FP_DECL_EX \
|
|
int _fex = 0; \
|
|
_FP_DECL_EX
|
|
#else
|
|
#define FP_DECL_EX int _fex = 0
|
|
#endif
|
|
|
|
#ifndef FP_INIT_ROUNDMODE
|
|
#define FP_INIT_ROUNDMODE do {} while (0)
|
|
#endif
|
|
|
|
#ifndef FP_HANDLE_EXCEPTIONS
|
|
#define FP_HANDLE_EXCEPTIONS do {} while (0)
|
|
#endif
|
|
|
|
#ifndef FP_INHIBIT_RESULTS
|
|
/* By default we write the results always.
|
|
* sfp-machine may override this and e.g.
|
|
* check if some exceptions are unmasked
|
|
* and inhibit it in such a case.
|
|
*/
|
|
#define FP_INHIBIT_RESULTS 0
|
|
#endif
|
|
|
|
#define FP_SET_EXCEPTION(ex) \
|
|
_fex |= (ex)
|
|
|
|
#define FP_UNSET_EXCEPTION(ex) \
|
|
_fex &= ~(ex)
|
|
|
|
#define FP_CLEAR_EXCEPTIONS \
|
|
_fex = 0
|
|
|
|
#define _FP_ROUND_NEAREST(wc, X) \
|
|
do { \
|
|
if ((_FP_FRAC_LOW_##wc(X) & 15) != _FP_WORK_ROUND) \
|
|
_FP_FRAC_ADDI_##wc(X, _FP_WORK_ROUND); \
|
|
} while (0)
|
|
|
|
#define _FP_ROUND_ZERO(wc, X) (void)0
|
|
|
|
#define _FP_ROUND_PINF(wc, X) \
|
|
do { \
|
|
if (!X##_s && (_FP_FRAC_LOW_##wc(X) & 7)) \
|
|
_FP_FRAC_ADDI_##wc(X, _FP_WORK_LSB); \
|
|
} while (0)
|
|
|
|
#define _FP_ROUND_MINF(wc, X) \
|
|
do { \
|
|
if (X##_s && (_FP_FRAC_LOW_##wc(X) & 7)) \
|
|
_FP_FRAC_ADDI_##wc(X, _FP_WORK_LSB); \
|
|
} while (0)
|
|
|
|
#define _FP_ROUND(wc, X) \
|
|
do { \
|
|
if (_FP_FRAC_LOW_##wc(X) & 7) \
|
|
FP_SET_EXCEPTION(FP_EX_INEXACT); \
|
|
switch (FP_ROUNDMODE) \
|
|
{ \
|
|
case FP_RND_NEAREST: \
|
|
_FP_ROUND_NEAREST(wc,X); \
|
|
break; \
|
|
case FP_RND_ZERO: \
|
|
_FP_ROUND_ZERO(wc,X); \
|
|
break; \
|
|
case FP_RND_PINF: \
|
|
_FP_ROUND_PINF(wc,X); \
|
|
break; \
|
|
case FP_RND_MINF: \
|
|
_FP_ROUND_MINF(wc,X); \
|
|
break; \
|
|
} \
|
|
} while (0)
|
|
|
|
#define FP_CLS_NORMAL 0
|
|
#define FP_CLS_ZERO 1
|
|
#define FP_CLS_INF 2
|
|
#define FP_CLS_NAN 3
|
|
|
|
#define _FP_CLS_COMBINE(x,y) (((x) << 2) | (y))
|
|
|
|
#include "op-1.h"
|
|
#include "op-2.h"
|
|
#include "op-4.h"
|
|
#include "op-8.h"
|
|
#include "op-common.h"
|
|
|
|
/* Sigh. Silly things longlong.h needs. */
|
|
#define UWtype _FP_W_TYPE
|
|
#define W_TYPE_SIZE _FP_W_TYPE_SIZE
|
|
|
|
typedef int QItype __attribute__((mode(QI)));
|
|
typedef int SItype __attribute__((mode(SI)));
|
|
typedef int DItype __attribute__((mode(DI)));
|
|
typedef unsigned int UQItype __attribute__((mode(QI)));
|
|
typedef unsigned int USItype __attribute__((mode(SI)));
|
|
typedef unsigned int UDItype __attribute__((mode(DI)));
|
|
#if _FP_W_TYPE_SIZE == 32
|
|
typedef unsigned int UHWtype __attribute__((mode(HI)));
|
|
#elif _FP_W_TYPE_SIZE == 64
|
|
typedef USItype UHWtype;
|
|
#endif
|
|
|
|
#ifndef umul_ppmm
|
|
#include <stdlib/longlong.h>
|
|
#endif
|
|
|
|
#include <stdlib.h>
|
|
|
|
#endif
|